parser.y

CE5.4英文源码,打造自己的CE 与大家分享一下.

| STRUCT_Y                   { $$ = STRUCT; } 
| UNION_Y                    { $$ = UNION;  }
;

poss_derived: /*EMPTY*/ { $$=NotDerived; }
 | ':' poss_access_modifier typename_class 
 { $$=$2; state.class_dcl = AsType($3); }
;

token_or_typename:
    TOKEN                   { $$ = $1;               }
  | TYPENAME                { $$ = $1->name.c_str(); }
;

class_name: /*empty*/       { $$ = "";               } 
  | token_or_typename       { $$ = $1;               } 
  | template_class          
   { PClass pc = AsType($1).as_class();
     $$ = pc->name().c_str();
    }
  | TEMPLATE_NAME           { $$ = $1->name.c_str(); }
;    

class_id: { dcl_set();} class_name { dcl_reset(); $$ = $2;  }
;

/* may well be useful to restrict the possible statements here */

class_declaration:
    class_or_struct class_id poss_derived '{'
      { 
	   tpush(state.add_class($1,$2,$3,state.class_dcl));
       if (check_error()) YYABORT;
	   state.init_block(CLASS_BLOCK); IEF_set();
       typedef_stack.push(state.in_typedef);
       state.in_typedef = false;
      }

	statement_list '}' 

     {
	   state.finalize_block(); IEF_reset();
  	   state.in_typedef = typedef_stack.pop(); 
	 } 

  | class_or_struct_ex class_id  
     { tpush(state.add_class($1,$2,ForwardClass,t_void)); }	 
;

access_specifier: access_modifier ':'
  { state.set_access_mode($1); }
;	

friend_declaration:
   FRIEND { state.in_friend_dcl = true; } function_declaration 
|  FRIEND CLASS class_name ';'{ state.add_friend_class($2); } 
;

/*** Enumerations **********/
/*** Note that getting the token value is often unreliable! ***/
/* *change 1.1.4 this is now defined as a part of a declaration, as C intended;
   Each enum constant is now added immediately, so that they may themselves be
   used to initialize further constants.
 */
enum_stmt:
  ENUM { dcl_set(); } poss_tag  
   {
    tpush(state.do_enum(tag_name));
    if (check_error()) YYABORT;
   }
  poss_enum_list
  { dcl_reset(); }
;

poss_enum_list: /*empty*/
| '{' enum_list '}'
;

poss_tag: /*EMPTY*/ {$$=NULL; tag_name="";} 
| TOKEN {$$=$1; tag_name=$1;}
| TYPENAME {$$=""; tag_name=$1->name.c_str();}
;

enum_item:
 TOKEN poss_initialization
 { 
  state.add_enum(tots(),$1,$2);
 }
;

enum_list: /*EMPTY*/
 | enum_item 
 | enum_list ',' enum_item
 ;

/* namespaces and using directives *****/
/*REF:NAMESPACE*/

namespace_declaration:
  NAMESPACE { dcl_set(); } poss_class_name 
  { dcl_reset(); 
    state.add_namespace($3 ? $3 : "");
    state.in_class = true;
    if (check_error()) YYABORT;
   }
  block 
;

poss_class_name: /*empty*/  { $$ = NULL; }
 | class_name { $$ = $1;  }
;

using_directive:
  USING NAMESPACE TYPENAME ';'
  /* note: cd also express this as $3->type.as_class()!! */
   { 
   	if ((Namespace *)$3->data != &state.context()) 
      state.context().inject_namespace((Namespace *)$3->data);
    else raise_error("Cannot inject a namespace into itself");
    if (check_error()) YYABORT;
   }
;

using_declaration:
  USING scoped_name ';'  
   {  state.context().inject_entry($2);  }
| USING scope TEMPLATE_NAME end_scope
   { state.context().inject_entry($3); }
| USING typename_class ';'
   { state.context().inject_entry(last_type_entry);  }
;

/* goto statements **********************/
goto_stmt:
  GOTO { dcl_set(true); } TOKEN { dcl_reset(); } ';'
  { do_goto($3); }
;

goto_label:
   TOKEN ':' { goto_label_new($1); }
|  IDEN  ':' { goto_label_existing($1); }
;


/* expressions *************************/

scope:
  typename_expr BINARY_SCOPE 
  { state.begin_scope(AsType($1)); $$ = $1; }
/*
| 
  TYPEOF open_parens expr close_parens BINARY_SCOPE
  { 
    Type t = typeof_op($3);
    state.begin_scope(t);
	$$ = AsTType(t);
  }
*/
;

global_scope:
  BINARY_SCOPE %prec UNARY_SCOPE
  { state.begin_scope(&global()); }

end_scope:
  { state.end_scope(); }
;

assign_op: 
 MUL_A | DIV_A | MOD_A | ADD_A | MINUS_A
 | SHL_A | SHR_A | BAND_A | BOR_A | XOR_A
;

scoped_name: IDEN  
| scope scoped_name end_scope
  { $$ = $2; }
| global_scope IDEN end_scope
  { $$ = $2; }
;

expr: _expr
 {   if (check_error()) YYABORT;   $$ = $1; }
;  

poss_size: /*EMPTY*/ { $$ = NULL; }
 | '[' _expr ']' %prec ARRAY { $$ = $2; }
;                

type_expression: type_expr 
{ dcl_reset(); $$=$1; state.token_stack.pop(); tpop(); }
;

typecast_type: STATIC_CAST | CONST_CAST | DYNAMIC_CAST | REINTERPRET_CAST
;

type_bracket: LESS_THAN type_expression GREATER 
                  { $$=$2; }
;


_expr: 
 CONSTANT       { $$ =  entry_op($1); }
 | scoped_name         { $$ =  entry_op($1); } 
/* | scoped_name template_type_list { $$ = entry_op($1); } */
 | '(' _expr ')' { $$ =  $2; }
/* binary arith operators */
| _expr STAR _expr    { $$=arith_op(STAR,$1,$3); }
| _expr DIVIDE _expr    { $$=arith_op(DIVIDE,$1,$3); }
| _expr MODULO _expr    { $$=arith_op(MODULO,$1,$3); }
| _expr PLUS _expr   { $$=arith_op(PLUS,$1,$3); }
| _expr MINUS _expr  { $$=arith_op(MINUS,$1,$3); }
| _expr BIN_AND _expr { $$=arith_op(BIN_AND,$1,$3); }
| _expr BIN_OR _expr { $$=arith_op(BIN_OR,$1,$3); }
/* unary arith */
| PLUS _expr %prec UPLUS     { $$=$2; }
| MINUS _expr %prec UMINUS   { $$=unary_op(UMINUS,$2); }
/* relational */
| LOG_NOT _expr         { $$=relational_op(LOG_NOT,$2,NULL); }
| _expr LESS_THAN _expr   { $$=relational_op(LESS_THAN,$1,$3); }
| _expr GREATER _expr   { $$=relational_op(GREATER,$1,$3); }
| _expr LEQ _expr   { $$=relational_op(LEQ,$1,$3); }
| _expr GEQ _expr   { $$=relational_op(GEQ,$1,$3); }
| _expr EQUAL _expr   { $$=equal_op($1,$3); }
| _expr NOT_EQUAL _expr   { $$=relational_op(NOT_EQUAL,$1,$3); }
| _expr LOG_AND _expr   { $$=relational_op(LOG_AND,$1,$3); }
| _expr LOG_OR _expr   { $$=relational_op(LOG_OR,$1,$3); }
/* assignment */
| _expr ASSIGN _expr { $$=assign_op($1,$3); }
| _expr assign_op _expr { $$=compound_assign_op($2,$1,$3); }
/* inc & dec */
| _expr INCR        { $$=inc_dec_op(INCR,$1,true); }
| INCR _expr        { $$=inc_dec_op(INCR,$2,false); }
| _expr DECR        { $$=inc_dec_op(DECR,$1,true); }
| DECR _expr        { $$=inc_dec_op(DECR,$2,false); }
/* misc. */
/* *fix 0.9.2 sizeof() now works properly w/ arrays */
/* *fix 1.2.3 sizeof(int)*N was broken; we now require the parens */
| SIZEOF '(' _expr ')'     { 
    if ($3->is_entry()) $$ = sizeof_op(size_of_entry($3->entry()));
	              else  $$ = sizeof_op($3->type().size());
 }
| SIZEOF '(' type_expression ')' { $$=sizeof_op(AsType($3).size());  }
| _expr ARITH_IF _expr ':' _expr { $$=arith_if_op($1,$3,$5); }
| _expr COMMA _expr  { $$=bin_op(COMMA,$1,$3); }
| NEW type_name poss_size 
  { $$ = new_op(tpop(),$3,NULL);  }

| NEW TYPENAME_FUNCTION  { tpush($2->type); } function_arg_list /*typename_function*/
  { $$ = new_op(tpop(),NULL,$4);  }

| NEW type_name function_arg_list
  { $$ = new_op(tpop(),NULL,$3);  }
| DELETE poss_array _expr            { $$ = delete_op($3,$2==1); }
| STAR _expr  %prec DEREF  { $$ = deref_op($2); }
| ADDR _expr               { $$ = addr_op($2); }
/** typecasts *****/
| typecast_type type_bracket '(' _expr ')' 
  { $$ = typecast_op($1,AsType($2),$4); }

| TYPENAME_FUNCTION  function_arg_list  /*typename_function*/
  { $$ = function_cast_op($1->type /*AsType($1)*/,$2); }

| '(' type_expression ')' _expr  %prec TYPECAST
  { $$ = typecast_op(REINTERPRET_CAST,AsType($2),$4); }

/* bitwise */
| BIN_NOT _expr        { $$=unary_op(BIN_NOT,$2); }
| _expr LSHIFT _expr    { $$=bin_op(LSHIFT,$1,$3); }
| _expr RSHIFT _expr    { $$=bin_op(RSHIFT,$1,$3); }
| _expr ADDR _expr %prec BIN_AND  { $$=bin_op(BIN_AND,$1,$3); }
| _expr BIN_XOR _expr  { $$=bin_op(BIN_XOR,$1,$3); }
| _expr ADDR _expr %prec BIN_OR { $$=bin_op(BIN_OR,$1,$3); }

| _expr '[' _expr ']' %prec ARRAY
  { $$=array_op($1, $3); }
  
| _expr function_arg_list { $$=function_op($1,$2); }
  
| _expr DOT 
  {dcl_set(); } 
  TOKEN
  { dcl_reset(); $$=selection_op($1,$4,false);  }
  
| _expr ARROW
  {dcl_set();}
  TOKEN
  { dcl_reset(); $$=selection_op($1,$4,true);  } 

/* *add 1.2.9a We forgot the .* operator! */
| _expr MEMBER_ARROW
  {dcl_set();}
  TOKEN
  { dcl_reset(); $$=selection_op($1,$4,true,true);  }

| error { raise_error("error in expression"); YYABORT; } 
;

poss_array: /*EMPTY*/ { $$ = 0; }
| '[' ']'  { $$ = 1; }
;

poss_function_arg_list: /*EMPTY*/ { $$ = NULL; }
| function_arg_list { $$ = $1; }
;

function_arg_list:  '(' ')'     { $$ = new ExprList; }
|   init_list                   { $$ = $1; }
;

init_list: 
  begin_list
  expr_list
  end_list %prec FUN_CALL            { $$ = $2; } 
;

expr_list: 
   _expr                { $$ = new ExprList; $$->push_back($1);  }
 | expr_list ',' _expr  { $$ = $1; $$->push_back($3); }  
 | error               { raise_error("Error in arg list"); YYABORT; }
 ;

/*** Control statements **************************/
condition:
   '(' expr ')' { $$ = $2; }
/* |  '(' declaration ')' { $$ */
;

poss_expr: /*EMPTY*/ { $$ = NULL; }
 | expr { $$ = $1; }
;

controlled_statement:
  {IEF_set();}
  statement
  {IEF_reset(); check_temp_context(); }
;

if_front:
  IF condition { do_loop_start($2,false); }
;

if_stmt: 
  if_front controlled_statement { do_loop_end(false); }
;

if_else_stmt:
  if_front controlled_statement   
  ELSE                             { do_loop_end(true,true); } 
  controlled_statement             { do_loop_end(false);     }
;

while_stmt:
  WHILE                  { label_here(); state.in_loop = true; } 
  condition              { do_loop_start($3,true); }
  controlled_statement   { do_loop_end(true); state.in_loop = false;}
;

/* fix 1.2.3 break was broken in do-while statements */
do_stmt:
  DO                           { label_here(); push_label_stack(); state.in_loop = true;}
   controlled_statement      
  WHILE condition              { do_do_end($5); state.in_loop = false}
;

for_init: ';'
|  expr ';'    { code().compile($1,DROP_VALUE); }
|  declaration
;

for_stmt:
  FOR  '(' { state.init_block(PLAIN_BLOCK); }   /*correct scoping for any dcls*/
    for_init                   { label_here();	state.in_loop = true; } 
    poss_expr ';'
    poss_expr ')'              { do_loop_start($6,true); }
  controlled_statement         { do_for_end($8);    state.in_loop = false;
								 state.finalize_block();
							   }
;

switch_stmt:
  SWITCH '(' expr ')' { do_switch($3); } block
;

return_stmt: RETURN poss_expr ';'
  { if (!do_return ($2)) { check_error(); YYABORT; }  }
;

case_label:
  CASE expr ':'
  { do_case ($2);   }
| DEFAULT ':'
  { do_case(NULL);  } 
;

break_stmt:  BREAK ';'
 { if (!do_break_continue(BREAK)) { check_error(); YYABORT; } }
;

continue_stmt: CONTINUE ';'
 { if (!do_break_continue(CONTINUE)) { check_error(); YYABORT; } }
;

/*** Exception Handling ****/

try_catch_stmt:
  try_block catch_block_list
  { do_end_try_catch_block(true); }
;

try_block:
  TRY
  { state.init_block(PLAIN_BLOCK); IEF_set(); 
	do_start_try_block();  }
  except_block
;

except_block:
  '{' statement_list '}'

   { state.finalize_block(); IEF_reset();
     do_end_try_catch_block(false);   } 
;

catch_block:
  CATCH arg_list
  { state.init_block(PLAIN_BLOCK); IEF_set(); 
    do_start_catch_block(); if (check_error()) YYABORT; }
  except_block
;

catch_block_list:
  catch_block
| catch_block catch_block_list
;

throw_stmt:
  THROW poss_expr ';'
  { do_throw($2); }
;

/************* Templates *****************/

typename_function:
  TYPENAME_FUNCTION { $$ = AsTType($1->type); }
| template_class    { $$ = $1; }
;

/***** Declaration context types ****/
typename_class:
  TYPENAME       { last_type_entry = $1; $$ = AsTType($1->type); }
| template_class { $$ = $1; }
| scope typename_class end_scope { $$ = $2; }
;

/***** Expression context types ***/
typename_expr:
  TYPENAME_FUNCTION { $$ = AsTType($1->type); }
| template_expr    { $$ = $1; } 
| scope typename_expr end_scope { $$ = $2; }
;

template_class:
TEMPLATE_NAME template_type_list
   { $$ = AsTType(Template::get_template_type($1,$2)); }
;

template_expr:
TEMPLATE_NAME_EXPR template_type_list
   { $$ = AsTType(Template::get_template_type($1,$2)); }
;


template_header:
 TEMPLATE template_type_list
 { Template::do_template_header($2); }
;

template_function_declaration:
 template_header
   function_front 
  { Template::do_function_template(); 
  	if (yychar != YYEMPTY) yyclearin;
  }
;

template_class_declaration:
  template_class_header  template_class_name
   {
    dcl_reset();    
    Template::do_class_template($1,$2,yychar,NULL);
	if (yychar != YYEMPTY) yyclearin;
   }
| template_class_header  template_class_name template_type_list
   {
    dcl_reset();        
    Template::do_class_template($1,$2,yychar,$3);
	if (yychar != YYEMPTY) yyclearin;
   }
;

struct_or_class_x:
  STRUCT_X | CLASS_X
;

template_class_header:
  template_header struct_or_class_x
   { dcl_set(); $$ = $2; }
;

template_class_name: TOKEN           { $$ = $1;                     }
  |         TEMPLATE_NAME            { $$ = $1->name.c_str();       }
;    

/* note: this will work as long as they're just plain CONSTANTs!*/
begin_templ_list:  LESS_THAN { dcl_set(true); state.begin_templ_list(); }
;
end_templ_list:    GREATER   { dcl_reset();   state.end_templ_list();   }
;

template_type_list: 
  begin_templ_list end_templ_list                 { $$ = new TypeList; }
| begin_templ_list templ_item_list end_templ_list { $$ = $2; }
;

/* rather like expr_list! */
templ_item_list:  
  templ_item                       { $$ = new TypeList; $$->push_back(AsType($1)); }
| templ_item_list ',' templ_item   { $$ = $1; $$->push_back(AsType($3));   } 
;

class_item:
  CLASS TOKEN { $$ = $2; }
| CLASS TYPENAME { $$ = $2->name.c_str(); }
;

class_parm: 
 class_item    {
   string c = $1;
   $$ = AsTType(Template::dummy(t_null,c));
  }
;

/* This is a bit cheeky - handles both kinds of template type lists! */
templ_item:
  type_expr        {
                     $$ = AsTType(Template::dummy(AsType($1),state.token_stack.pop()));
	                 dcl_reset();  tpop();
	               }
| CONSTANT         { $$ = AsTType(Template::dummy($1)); }
| class_parm       { $$ = $1; }
;

     
%%